remove CoinMarketCap logic

apps/explorer/config/config.exs

@@ -31,9 +31,6 @@ config :explorer, Explorer.ChainSpec.GenesisData, enabled: false, chain_spec_pat
 
 config :explorer, Explorer.Chain.Cache.BlockNumber, enabled: true
 
-config :explorer, Explorer.ExchangeRates.Source.CoinMarketCap,
-  pages: String.to_integer(System.get_env("COINMARKETCAP_PAGES") || "10")
-
 config :explorer, Explorer.ExchangeRates.Source.CoinGecko, coin_id: System.get_env("COIN_GECKO_ID", "poa-network")
 
 balances_update_interval =

apps/explorer/lib/explorer/exchange_rates/source.ex

@@ -2,8 +2,6 @@ defmodule Explorer.ExchangeRates.Source do
   @moduledoc """
   Behaviour for fetching exchange rates from external sources.
   """
-
-  alias Explorer.ExchangeRates.Source.CoinMarketCap
   alias Explorer.ExchangeRates.Token
   alias HTTPoison.{Error, Response}
 
@@ -12,29 +10,8 @@ defmodule Explorer.ExchangeRates.Source do
   """
   @spec fetch_exchange_rates(module) :: {:ok, [Token.t()]} | {:error, any}
   def fetch_exchange_rates(source \\ exchange_rates_source()) do
-    if(source == CoinMarketCap) do
-      fetch_exchange_rates_from_paginable_source(source)
-    else
     fetch_exchange_rates_request(source)
   end
-  end
-
-  defp fetch_exchange_rates_from_paginable_source(source, page \\ 1) do
-    case HTTPoison.get(source.source_url(page), headers()) do
-      {:ok, %Response{body: body, status_code: 200}} ->
-        cond do
-          body =~ Explorer.coin() -> {:ok, source.format_data(body)}
-          page == source.max_page_number -> {:error, "exchange rates not found for this network"}
-          true -> fetch_exchange_rates_from_paginable_source(source, page + 1)
-        end
-
-      {:ok, %Response{body: body, status_code: status_code}} when status_code in 400..502 ->
-        {:error, decode_json(body)["error"]}
-
-      {:error, %Error{reason: reason}} ->
-        {:error, reason}
-    end
-  end
 
   defp fetch_exchange_rates_request(source) do
     case HTTPoison.get(source.source_url(), headers()) do

apps/explorer/lib/explorer/exchange_rates/source/coin_market_cap.ex

@@ -1,52 +0,0 @@
-defmodule Explorer.ExchangeRates.Source.CoinMarketCap do
-  @moduledoc """
-  Adapter for fetching exchange rates from https://coinmarketcap.com.
-  """
-
-  alias Explorer.ExchangeRates.{Source, Token}
-
-  import Source, only: [decode_json: 1, to_decimal: 1]
-
-  @behaviour Source
-
-  @impl Source
-  def format_data(data) do
-    for item <- decode_json(data), not is_nil(item["last_updated"]) do
-      {last_updated_as_unix, _} = Integer.parse(item["last_updated"])
-      last_updated = DateTime.from_unix!(last_updated_as_unix)
-
-      %Token{
-        available_supply: to_decimal(item["available_supply"]),
-        total_supply: to_decimal(item["total_supply"]),
-        btc_value: to_decimal(item["price_btc"]),
-        id: item["id"],
-        last_updated: last_updated,
-        market_cap_usd: to_decimal(item["market_cap_usd"]),
-        name: item["name"],
-        symbol: item["symbol"],
-        usd_value: to_decimal(item["price_usd"]),
-        volume_24h_usd: to_decimal(item["24h_volume_usd"])
-      }
-    end
-  end
-
-  @impl Source
-  def source_url do
-    source_url(1)
-  end
-
-  def source_url(page) do
-    "#{base_url()}/v1/ticker/?start=#{page - 1}00"
-  end
-
-  def max_page_number, do: config(:pages)
-
-  defp base_url do
-    config(:base_url) || "https://api.coinmarketcap.com"
-  end
-
-  @spec config(atom()) :: term
-  defp config(key) do
-    Application.get_env(:explorer, __MODULE__, [])[key]
-  end
-end

apps/explorer/lib/explorer/exchange_rates/source/token_bridge.ex

@@ -45,7 +45,7 @@ defmodule Explorer.ExchangeRates.Source.TokenBridge do
 
   @spec secondary_source() :: module()
   defp secondary_source do
-    config(:secondary_source) || Explorer.ExchangeRates.Source.CoinMarketCap
+    config(:secondary_source) || Explorer.ExchangeRates.Source.CoinGecko
   end
 
   @spec config(atom()) :: term

apps/explorer/test/explorer/exchange_rates/source/coin_market_cap_test.exs

@@ -1,59 +0,0 @@
-defmodule Explorer.ExchangeRates.Source.CoinMarketCapTest do
-  use ExUnit.Case
-
-  alias Explorer.ExchangeRates.Token
-  alias Explorer.ExchangeRates.Source.CoinMarketCap
-
-  @json """
-  [
-    {
-      "id": "poa-network",
-      "name": "POA Network",
-      "symbol": "POA",
-      "rank": "103",
-      "price_usd": "0.485053",
-      "price_btc": "0.00007032",
-      "24h_volume_usd": "20185000.0",
-      "market_cap_usd": "98941986.0",
-      "available_supply": "203981804.0",
-      "total_supply": "254473964.0",
-      "max_supply": null,
-      "percent_change_1h": "-0.66",
-      "percent_change_24h": "12.34",
-      "percent_change_7d": "49.15",
-      "last_updated": "1523473200"
-    }
-  ]
-  """
-
-  describe "format_data/1" do
-    test "returns valid tokens with valid data" do
-      expected_date = ~N[2018-04-11 19:00:00] |> DateTime.from_naive!("Etc/UTC")
-
-      expected = [
-        %Token{
-          available_supply: Decimal.new("203981804.0"),
-          total_supply: Decimal.new("254473964.0"),
-          btc_value: Decimal.new("0.00007032"),
-          id: "poa-network",
-          last_updated: expected_date,
-          market_cap_usd: Decimal.new("98941986.0"),
-          name: "POA Network",
-          symbol: "POA",
-          usd_value: Decimal.new("0.485053"),
-          volume_24h_usd: Decimal.new("20185000.0")
-        }
-      ]
-
-      assert expected == CoinMarketCap.format_data(@json)
-    end
-
-    test "returns nothing when given bad data" do
-      bad_data = """
-        [{"id": "poa-network"}]
-      """
-
-      assert [] = CoinMarketCap.format_data(bad_data)
-    end
-  end
-end